Near-infrared light control of membrane potential by an electron donor–acceptor linked molecule

Takano, Yuta; Miyake, Kazuaki; Sobhanan, Jeladhara; Biju, Vasudevanpillai; Tkachenko, Nikolai V.; Imahori, Hiroshi

doi:10.1039/d0cc05326k

Cited by 6 publications

(2 citation statements)

References 26 publications

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“…The NIR-active molecular systems promise phototherapy, photo-uncaging-mediated drug delivery, and efficient chemical reactions because of the permeability of cells and tissues to NIR light 37 – 40 . In this context, we investigated the release of 1 O 2 from 1-O 2 under a pumped-pulsed NIR laser activation since coumarins possess a moderate two-photon absorption cross-Section 41 First, we verified that one-photon excitation under 404 nm laser excitation activated 1-O 2 (Fig.…”

Section: Resultsmentioning

confidence: 99%

Caging and photo-triggered uncaging of singlet oxygen by excited state engineering of electron donor–acceptor-linked molecular sensors

Sasikumar

Takano

Zhao

et al. 2022

Sci Rep

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Singlet oxygen (1O2), one of the most sought-after species in oxidative chemical reactions and photodynamic cancer therapy, is activated and neutralized in the atmosphere and living cells. It is essential to see "when" and "where" 1O2 is produced and delivered to understand and utilize it. There is an increasing demand for molecular sensor tools to capture, store, and supply 1O2, controlled by light and engineered singlet and triplet states, indicating the 1O2-capturing-releasing state. Here, we demonstrate the outstanding potential of an aminocoumarin-methylanthracene-based electron donor–acceptor molecule (1). Spectroscopic measurements confirm the formation of an endoperoxide (1-O2) which is not strongly fluorescent and remarkably different from previously reported 1O2 sensor molecules. Moreover, the photoexcitation on the dye in 1-O2 triggers fluorescence enhancement by the oxidative rearrangement and a competing 1O2 release. The unique ability of 1 will pave the way for the spatially and temporally controlled utilization of 1O2 in various areas such as chemical reactions and phototherapies.

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Section: Resultsmentioning

confidence: 99%

Caging and photo-triggered uncaging of singlet oxygen by excited state engineering of electron donor–acceptor-linked molecular sensors

Sasikumar

Takano

Zhao

et al. 2022

Sci Rep

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“…Due to the complex background and large discrepancies in the surface color, slight and early bruises are di cult to distinguish by image processing technology under visible light (Pan et al, 2019;Xing and De Baerdemaeker, 2007). The penetrability of near-infrared light in a tissue sample is deeper than that of visible light (Ding et al, 2021), and it is quite sensitive to changes in water content and soluble solids in the sample (Li et al, 2019;Takano et al, 2020). Therefore, a near-infrared image of an apple can more easily reveal bruising than a visible light image, which makes it possible for near-infrared imaging to identify early bruises in apples.…”

Section: Introductionmentioning

confidence: 99%

Early apple bruise recognition based on near-infrared imaging and grayscale gradient images

et al. 2023

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Early apple bruises, especially those occurring within half an hour, usually have no external symptoms and are di cult to nd. In this study, a fast and nondestructive detection method for early bruises based on a near-infrared camera and image recognition was developed. A total of thirty apple samples were photographed on both sides of each apple. Grayscale images of the apples were captured using a nearinfrared camera with a wavelength region between 900 and 2350 nm. Images of apples (n = 62) without bruises were collected. The same apples were arti cially damaged and photographed by the near-infrared camera immediately. The apples were photographed again at 30-35 min after bruising, and a total of 186 grayscale images were collected. As the glossiness of apples limits the accuracy in the detection of defects, a compound method was proposed consisting of nonlinear grayscale transformation and frequency-domain image ltering techniques, followed by the rst derivative to obtain the gradient grayscale image. Since bruises had distinct edges, bruise edge pixels were detected instead of sound bruise pixels. The compound method obtained a 97.62% classi cation accuracy for nonbruised apples and apples with fresh bruises. The experimental results show that it is feasible to identify early bruises in apples based on near-infrared camera imaging and gradient grayscale images. The method can also provide a reference for the in-situ nondestructive early bruise detection of apples and other fruits.

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Porphyrins as key components for photoinduced charge separation, solar cells and optogenetics

Imahori,

Akiyama

2024

J. Porphyrins Phthalocyanines

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This review presents typical examples of porphyrins, which serve as highly effective building blocks, primarily drawn from our past achievements. They function as both an electron donor and an energy donor/acceptor in various applications. These applications include photosynthetic and solar cell models, dye-sensitized solar cells, bulk heterojunction solar cells, and optogenetics based on photoinduced charge separation. Consequently, porphyrins are essential components for evaluating energy and electron transfer properties, as well as for energy and biological applications.

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Near-infrared light control of membrane potential by an electron donor–acceptor linked molecule

Abstract: (π-Extended porphyrin)–fullerene linked molecules are synthesized to utilize the molecular excited states induced by near-infrared light. One of the molecules successfully alters the membrane potential.

Cited by 6 publications

References 26 publications

Caging and photo-triggered uncaging of singlet oxygen by excited state engineering of electron donor–acceptor-linked molecular sensors

Caging and photo-triggered uncaging of singlet oxygen by excited state engineering of electron donor–acceptor-linked molecular sensors

Early apple bruise recognition based on near-infrared imaging and grayscale gradient images

Porphyrins as key components for photoinduced charge separation, solar cells and optogenetics

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